eHIV Review, Volume 1, Issue 9

HOME

CME INFORMATION

PROGRAM DIRECTORS

NEWSLETTER ARCHIVE

EDIT PROFILE

RECOMMEND TO A COLLEAGUE

VOLUME 1, NUMBER 9

Human Immunodeficiency Virus and Hepatitis C Virus Coinfection

In this Issue...

Hepatitis C virus (HCV) coinfection is common in people with human immunodeficiency virus (HIV). Recent reports highlight the importance of continuing transmission of HCV among HIV-infected men who have sex with men (MSM) and of the impact of HCV infection relative to that of HIV infection on mortality rates in the United States. Further, in an era of effective antiretroviral therapy, liver disease caused by HCV is a clinically significant issue among patients infected with HIV, emerging in some studies as the second leading cause of death in this population. In this context, treating HCV infection is recommended for patients with coinfection who have significant hepatic fibrosis. New data indicate that people who have HIV/HCV coinfections may benefit from HCV treatment with regimens that include the HCV NS3/4A protease inhibitors telaprevir (TPV) and boceprevir (BOC), in combination with peginterferon plus ribavirin (Peg-IFN/RBV). However, the use of such regimens is complicated by drug-drug interactions with antiretroviral therapy, a paucity of published data, and the lack of an approved indication for treating patients with coinfections.

In this issue, we review the current literature describing the sexual transmission of HCV in HIV-infected MSM, the impact of HIV and HCV on mortality rates in the United States, and treating HCV with TPV or BOC in combination with Peg-IFN/RBV in patients infected with HIV.

LEARNING OBJECTIVES

After completing this activity, the participant will demonstrate the ability to:

		Describe the role of sexual transmission of hepatitis C virus (HCV) among human immunodeficiency virus (HIV)-infected men who have sex with men

		Discuss the relative impact of HIV, HCV, or both on mortality rates in the United States

		Identify the potential benefits and risks associated with the use of HCV NS3/4A protease inhibitors for treating HCV in persons infected with HIV

*The Johns Hopkins University School of Medicine takes responsibility for the content, quality, and scientific integrity of this CME activity.*

IMPORTANT CME INFORMATION

Program Begins Below


	Accreditation Statements The Johns Hopkins University School of Medicine is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. Credit Designations eNewsletter: The Johns Hopkins University School of Medicine designates this enduring material for a maximum of 1.0 AMA PRA Category 1 Credit(s)™. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Podcast: The Johns Hopkins University School of Medicine designates this enduring material for a maximum of 0.5 AMA PRA Category 1 Credit(s)™. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Successful Completion To successfully complete this activity, participants must read the content, then link to The Johns Hopkins University School of Medicine's website to complete the post-test and evaluation. Once you receive a passing grade, you can access and print your certificate of credit. NOTE: If you already have registered for other Hopkins CME courses on the OCME website, simply enter the requested information when prompted. There are no fees or prerequisites for this activity. This activity is supported by educational grants from Abbott Laboratories, Boehringer Ingelheim Pharmaceuticals, Inc., and Bristol-Myers Squibb. Launch Date June 20, 2012; activities expire 1 year from the date of publication. planner Disclosure As a provider accredited by the Accreditation Council for Continuing Medical Education (ACCME), The Johns Hopkins University School of Medicine Office of Continuing Medical (OCME) requires signed disclosure of the existence of any financial relationships with industry from any individual in a position to control content of a CME activity sponsored by OCME. Members of the Planning Committee are required to disclose all relationships, regardless of their relevance to the activity content. Faculty are required to disclose only those relationships that are relevant to their specific presentations. The following relationships have been reported for this activity: Richard Moore, MD, MHS has disclosed he has received grants/research support from Pfizer and GlaxoSmithKline. He has also served as a consultant for Bristol Myers-Squibb. No other planners have indicated that they have any financial interests or relationships with a commercial entity. Internet CME Policy The Office of Continuing Medical Education (CME) at The Johns Hopkins University School of Medicine is committed to protecting the privacy of its members and customers. The Johns Hopkins University School of Medicine maintains its Internet site as an information resource and service for physicians, other health professionals, and the public. Continuing Medical Education at The Johns Hopkins University School of Medicine will keep your personal and credit information confidential when you participate in an Internet-based CME program. Your information will never be given to anyone outside of the Johns Hopkins University School of Medicine program. CME collects only the information necessary to provide you with the services that you request. Disclaimer Statement The opinions and recommendations expressed by faculty and other experts whose input is included in this program are their own. This enduring material is produced for educational purposes only. Use of The Johns Hopkins University School of Medicine name implies review of educational format design and approach. Please review the complete prescribing information for specific drugs or combinations of drugs, including indications, contraindications, warnings, and adverse effects before administering pharmacologic therapy to patients.

Statement of Responsibility
The Johns Hopkins University School of Medicine takes responsibility for the content, quality, and scientific integrity of this CME activity.

STATEMENT OF NEED:
Three central ideas emerged from our needs assessment. In order to provide optimal treatment to patients with HIV.

	Clinicians caring for patients with HIV need current information about: appropriate treatment and maintenance of care…guidance for treating comorbidities…and information about emerging findings for treating HIV-associated neurocognitive disorders (HAND)
	The need for more information on HIV topics including updated guidelines for HIV, treating older patients with HIV, managing patients with comorbidities and coinfections, treatment and sequencing strategies for maximizing future therapeutic options, and new and emerging agents for HIV
	Treating comorbidities in patients with HIV, especially among people older than age 50

Intended Audience
This activity has been developed for infectious disease specialists, primary care physicians, nurse practitioners, and other health care practitioners whose work/practice includes treating HIV patients.

Confidentiality Disclaimer for Attendees
I certify that I am attending a Johns Hopkins University School of Medicine CME activity for accredited training and/or educational purposes.

I understand that while I am attending in this capacity, I may be exposed to "protected health information," as that term is defined and used in Hopkins policies and in the federal HIPAA privacy regulations (the Privacy Regulations). Protected health information is information about a person's health or treatment that identifies the person.

I pledge and agree to use and disclose any of this protected health information only for the training and/or educational purposes of my visit and to keep the information confidential.

I understand that I may direct to the Johns Hopkins Privacy Officer any questions I have about my obligations under this Confidentiality Pledge or under any of the Hopkins policies and procedures and applicable laws and regulations related to confidentiality. The contact information is Johns Hopkins Privacy Officer, telephone: 410-735-6509, e-mail: HIPAA@jhmi.edu.

"The Office of Continuing Medical Education at The Johns Hopkins University School of Medicine, as provider of this activity, has relayed information with the CME attendees/participants and certifies that the visitor is attending for training, education and/or observation purposes only."

For CME Questions, please contact the CME Office at (410) 955-2959 or e-mail cmenet@jhmi.edu.

For CME Certificates, please call (410) 502-9634.

Johns Hopkins University School of Medicine
Office of Continuing Medical Education
Turner 20/720 Rutland Avenue
Baltimore, Maryland 21205-2195

Reviewed and Approved by
General Counsel, Johns Hopkins Medicine (4/1/03)
Updated 4/09

Hardware & Software Requirements
Pentium 800 processor or greater, Windows 98/NT/2000/XP/7 or Mac OS 9/X, Microsoft Internet Explorer 5.5 or later, 56K or better modem, Windows Media Player 9.0 or later, 128 MB of RAM, sound card and speakers, Adobe Acrobat Reader, storage, Internet connectivity, and minimum connection speed. Monitor settings: High color at 800 x 600 pixels.

this issue


		COMMENTARY from our Guest Author

		SEXUAL TRANSMISSION OF HCV INFECTION AMONG HIV-INFECTED MEN WHO HAVE SEX WITH MEN

		VIRAL HEPATITIS AND INCREASING BURDEN OF MORTALITY

		TELAPREVIR PLUS PEGINTERFERON AND RIBAVIRIN IN HCV/HIV–COINFECTED INDIVIDUALS

		BOCEPREVIR PLUS PEGINTERFERON AND RIBAVIRIN IN HCV/HIV–COINFECTED INDIVIDUALS

Program Directors

Richard Moore, MD, MHS
Professor of Medicine
Director, Moore Clinic for HIV Care
Divisions of Infectious Diseases and Clinical Pharmacology
The Johns Hopkins University School of Medicine
Baltimore, Maryland

Michael Melia, MD
Assistant Professor of Medicine
Associate fellowship Program Director
Division of Infectious Diseases
The Johns Hopkins University School of Medicine
Baltimore, Maryland

Guest Author of the Month

		Commentary & Reviews:
		Mark S. Sulkowski, MD Professor of Medicine Director, Viral Hepatitis Center Divisions of Infectious Diseases and Gastroenterology/Hepatology The Johns Hopkins University School of Medicine Baltimore, Maryland

Guest Faculty Disclosure

Mark S. Sulkowski, MD has disclosed that he has received grants/research support from AbbVie Inc., Boehringer Ingelheim Pharmaceuticals Inc., Bristol-Myers Squibb, Gilead, Janssen, Merck, Roche, and Vertex Pharmaceuticals. He has also served as a consultant for AbbVie Inc., Boehringer Ingelheim Pharmaceuticals, Bristol-Myers Squibb, Gilead, Janssen, Merck, Roche, and Vertex Pharmaceuticals.

Unlabeled/Unapproved Uses

The author has indicated that he will reference the unlabeled/unapproved uses of telaprevir and boceprevir for the treatment of HCV in HIV-infected persons in this presentation.

Program Directors' Disclosures


	Program Information CME Info Accreditation Credit Designations Intended Audience Learning Objectives Internet CME Policy Planner Disclosure Disclaimer Statement Length of Activity 1.0 hour Physician Release Date February 19, 2013 Expiration Date February 18, 2014


	TO ACCESS THE POST–TEST Step 1. Review the CME Information and study the educational content. Step 2. Click the post–test link at the end of the newsletter. Step 3. Follow the instructions to access a post–test.

Download the iPhone App!

Watch our eSeminar Series Webcast

Commentary

With the development of effective therapies against human immunodeficiency virus (HIV), hepatitis C virus (HCV) infection has become a major cause of morbidity and mortality among people infected with HIV. Indeed, in many regions of the world, liver disease is the second leading cause of death in this population.¹ Accordingly, clinicians who care for patients infected with HIV must focus their attention on preventing new HCV infections in persons with HIV who are not coinfected and also preventing progressive liver disease, end-stage liver disease, hepatocellular carcinoma, and death in those coinfected with HIV/HCV.

In the absence of an effective vaccine, preventing acute HCV infection among those infected with HIV can be achieved by reducing behaviors that place uninfected persons at risk for HCV infection. Given the ease of HCV transmission through contaminated blood, reducing the frequency of injection-drug use and/or reusing syringes or other injection equipment is essential.² Although the efficiency of sexual transmission of HCV is lower than that of HIV or hepatitis B virus (HBV) infection, recent studies clearly demonstrate that HCV is a sexually transmitted infection, particularly among HIV-infected men who have sex with men. The July 2011 Morbidity and Mortality Weekly Report (MMWR), reviewed in this issue, underscores the role of the sexual spread of HCV infection among HIV-infected MSM in the United States, which has significant implications for disease prevention. First, persons infected with HIV should be screened for HCV and, if the results are negative, educated about the risk for infection and reminded to use condoms to prevent sexual transmission. Second, persons who are HCV-seronegative and continue to engage in risky behaviors should undergo serial testing of serum alanine aminotransferase (ALT) levels and annual HCV antibody assays. Those with acute elevations in serum ALT levels should be promptly evaluated for causes of hepatitis, which should include HCV with antibody and HCV RNA testing. Identifying acute HCV infection is critical because antiviral therapy is significantly more effective at this stage and should be considered for patients who are acutely coinfected with HIV and HCV.

Among patients with HIV who are chronically infected with HCV, the priority is preventing liver disease. Importantly, the study by Ly and colleagues (reviewed herein) revealed that in 2007, more Americans died of HCV infection (~15,000) than of HIV infection (~12,700). This study also demonstrated that HIV coinfection was independently associated with an increased risk for dying of HCV infection (adjusted odds ratio [AOR], 1.8), highlighting the negative impact of HIV infection on the natural history of HCV. The delivery of effective treatment to cure HCV infection is needed to prevent the consequences of the disease in the coinfected patient population. Over the last decade, treatment with peginterferon (Peg-IFN) plus ribavirin (RBV) has been recommended for coinfected patients who are at the greatest risk for liver disease; however, the effectiveness of HCV treatment in this population has been disappointing. The reasons for this limited effectiveness include low rates of treatment initiation, high prevalence of relative and absolute contraindications to these agents, and low rates of sustained virologic response (SVR) among treated patients—particularly those coinfected with genotype 1 HCV infection and African Americans. As such, considerable interest has focused recently on using the HCV NS3/4A protease inhibitors telaprevir (TVR) and boceprevir (BOC), in combination with Peg-IFN/RBV, for treating HCV in patients infected with HIV.

In March 2012, SVR results from two small phase 2 studies of TVR (n = 60) and BOC (n = 98), both reviewed in this issue, in combination with Peg-IFN/RBV were presented at the 19th Conference on Retroviruses and Opportunistic Infections (CROI).

In the TPV study, SVR 12 weeks after stopping therapy (SVR-12) was observed in 28 of 38 patients infected with genotype 1 HCV who were treated with TPV plus Peg-IFN/RBV (74%), vs 10 of 22 treated with Peg-IFN/RBV alone (45% ). Data from drug interaction studies in healthy volunteers and data from coinfected patients in this trial support the administration of TVR with atazanavir and raltegravir at the standard recommended TVR dose (750 mg every 7 to 9 hours), and with efavirenz at an increased TVR dose (1125 mg every 7 to 9 hours).
In the BOC study, SVR-12 was observed in 37 of 61 patients infected with HCV genotype 1 HCV who were treated with BOC plus Peg-IFN/RBV (60.7%), vs 9 of 34 treated with Peg-IFN/RBV alone (26.5%). In this study, patients received antiretroviral therapy that included ritonavir-boosted HIV protease inhibitors plus dual nucleoside reverse-transcriptase inhibitors. After this study was completed, however, drug interaction studies in healthy volunteers revealed that BOC can be coadministered with raltegravir, but coadministration of BOC with ritonavir-boosted HIV protease inhibitors or efavirenz is not recommended because of bidirectional drug interactions.

Taken together, these limited data indicate that the HCV protease inhibitors TPV and BOC, administered in combination with Peg-IFN/RBV, increase cure rates (SVR-12) among individuals with HIV/HCV coinfection, with manageable toxicity and drug-drug interactions observed. In the context of rapidly evolving HCV drug development, however, strong consideration should be given treating patients coinfected with HIV and HCV in clinical trials of direct-acting HCV therapies or deferring HCV treatment in those with minimal HCV-related liver disease.

Commentary References

1.	Data Collection on Adverse Events of Anti-HIV drugs (D:A:D)Study Group, Smith C, Sabin CA, et al. . Factors associated with specific causes of death amongst HIV-positive Individuals in the D:A:D Study. AIDS. 2010l24(10):1537-1548.

2.	van de Laar TJ, Matthews GV, Prins M, Danta M. Acute hepatitis C in HIV-infected men who have sex with men: an emerging sexually transmitted infection. AIDS. 2010;24(12):1799-1812.

SEXUAL TRANSMISSION OF HCV INFECTION AMONG HIV-INFECTED MEN WHO HAVE SEX WITH MEN

Centers for Disease Control and prevention (CDC). Sexual transmission of hepatitis C virus among HIV-infected men who have sex with men — New York City, 2005–2010. MMWR Morb Mortal Wkly Rep. 2011;60(28):945-950
(For non-subscribers to this journal, an additional fee may apply to obtain full-text articles.)


		View journal abstract				View full article

Worldwide, the major mode of HCV transmission is by percutaneous exposure to blood; the contribution of sexual transmission of HCV to the epidemic has been difficult to quantify. Over the last decade, however, reports from large European cities have identified clusters of acute HCV infection attributed to sexual practices among MSM infected with HIV. In July 2011, collaborators at the Centers for Disease Control and Prevention (CDC) and the Mount Sinai School of Medicine (New York, NY) described the role of sexual transmission in a matched case-control study involving 74 men infected with HIV who were identified with acute HCV infection in the absence of reported injection-drug use between 2005 and 2010. In this analysis, Dr. Daniel Fierer and colleagues described the characteristics of these 74 men, who presented with acute HCV infection asymptomatic ALT elevations were discovered (median peak ALT, 665 U/L). Importantly, the majority of men were taking antiretroviral therapy (74%) and had undetectable HIV RNA levels at the time of HCV diagnosis (68%).

Interestingly, phylogenetic analysis of the NS5B region from HCV strains recovered from 50 of the 74 patients identified five clusters of closely related HCV genotype 1a variants from 26 of the men with acute infections. To further understand risk factors for HCV infection in this population, the researchers conducted a matched case-control study involving 22 MSM infected with HIV who had acute HCV (cases) and 53 age-matched, MSM with HIV who did not have acute HCV (controls). Both case and control patients completed self-administered questionnaires regarding their sexual practices and drug-use behaviors over the preceding 12 months.

Results from the multivariable, conditional, logistic regression analysis found that unprotected, receptive anal intercourse with no condom and with ejaculation of the partner (AOR, 23.00) and sex while high on methamphetamine (AOR, 28.56) were both significantly associated with acquiring HCV infection (P = .009 and P = .02, respectively). Although the findings of this analysis are limited by the reliance of self-report to identify risk behaviors and exclude injection-drug use, the authors concluded that HCV should be considered a sexually transmitted disease among MSM infected with HIV. Therefore, patients infected with HIV should be counseled on the risk for HCV transmission by sexual encounters and reminded to use condoms. Additionally, routine screening for HCV infection with antibody testing and serum ALT levels should be performed in MSM infected with HIV.

VIRAL HEPATITIS AND INCREASING BURDEN OF MORTALITY

Ly KN, Xing J, Klevens RM, Jiles RB, Ward JW, Holmberg SD. The increasing burden of mortality from viral hepatitis in the United States between 1999 and 2007. Ann Intern Med. 2012;156(4): 271-278.

(For non-subscribers to this journal, an additional fee may apply to obtain full-text articles.)


		View journal abstract				View full article

In the United States, the National Center for Health Statistics compiles information on multiple-cause mortality from all death records according to a standardized format. To understand the relative contribution of HBV, HCV, and HIV infection, researchers from the CDC described trends in the incidence of death associated with these infections between 1999 and 2007. Interestingly, over this time period, the annual average age-adjusted mortality rate for HIV-related deaths decreased significantly (-0.21 deaths per 100,000 person-years; P = .001), whereas the annual average adjusted mortality for HCV-related deaths increased (+0.18 deaths per 100,000 person-years; P = .002); HBV-related deaths were unchanged. Importantly, in 2007, the mortality rate for HCV-related deaths exceeded that for HIV-related deaths. In that year, HCV infection was the underlying or contributing factor in 15,106 deaths; in contrast, HIV and HBV infections were the underlying or contributing factor in 12,734 deaths and 1815 deaths, respectively.

In their analysis, the researchers also evaluated the contribution of coinfection with one or more of these pathogens, as well as alcohol-related conditions. Among persons with HBV-related deaths, the most frequently reported comorbid conditions were HCV coinfection (30% of deaths), alcohol-related conditions (13%), and HIV coinfection (6%). In multivariate models, HBV-related deaths were strongly associated with chronic liver disease and alcohol, as well as HCV coinfection (AOR, 31.5) and HIV coinfection (AOR, 4.0). Among persons whose deaths were related to HCV, the most frequently reported comorbid conditions were alcohol-related conditions (19% of deaths), HBV coinfection (4% of deaths), and HIV coinfection (3% of deaths). The majority of HCV-related deaths were reported in persons between 45 and 64 years of age. In multivariate models, HCV-related deaths were strongly associated with age (45 to 54 years old; 55 to 64 years old, nonwhite race or ethnicity, male sex, chronic liver disease, and alcohol-related conditions, as well as HBV coinfection (AOR, 29.9) and HIV coinfection (AOR 1.8).

The authors concluded that by 2007, HCV had surpassed HIV as a cause of death in the United States, with the majority of deaths occurring in middle-aged adults. Alcohol use and HIV coinfection were important, potentially modifiable comorbid conditions contributing to HCV-related deaths. The researchers cautioned that because of limitations in cause-of-death data derived from death certificates, this study likely underreports deaths related to HBV and HCV. Despite this possible underreporting of the impact of viral hepatitis, the study underscores the critical and unrecognized public health impact of these pathogens. Additionally, the analysis provides further evidence that HIV coinfection is strongly linked to both HBV- and HCV-related deaths, highlighting the medical significance of these infections in patients infected with HIV.

TELAPREVIR PLUS PEGINTERFERON AND RIBAVIRIN IN HCV/HIV–COINFECTED INDIVIDUALS

Dieterich D, Soriano V, Sherman K, et al; on behalf of the Study 110 Team. Telaprevir in combination with pegylated interferon-a-2a+RBV in HCV/HIV-co-infected patients: a 24-week treatment interim analysis. Presented at: 19th Conference on Retroviruses and Opportunistic Infections; March 5-8, 2012; Seattle, Washington. Abstract 46.

(For non-subscribers to this journal, an additional fee may apply to obtain full-text articles.)


		View journal abstract				View full article

In May 2011, TVR, an HCV NS3/4A protease inhibitor, was approved by the US Food and Drug Administration (FDA) for treating genotype 1 chronic HCV infection, in combination with Peg-IFN/RBV. At the time of FDA approval, however, the safety and efficacy of TVR plus Peg-IFN/RBV in HIV/HCV–coinfected patients had not been established.

On March 5, 2012, the results of a phase 2a study of TVR vs placebo in combination with Peg-IFN/RBV for the treatment of genotype 1 chronic HCV infection in adults infected with HIV adults were presented at the 19th CROI. In this study, 60 patients coinfected with HIV and HCV were randomized to treatment with 12 weeks of combination therapy with TPV (n = 38) or placebo (n = 22) plus Peg-IFN/RBV, followed by 36 weeks of Peg-IFN/RBV alone. Based on previously conducted drug-drug interaction studies, coinfected patients were required to be on one of three HIV treatment regimens: no antiretroviral therapy (n =13), atazanavir/ritonavir plus tenofovir/emtricitabine (n = 23), or efavirenz plus tenofovir/emtricitabine (n = 24). Notably, patients taking efavirenz-based antiretroviral therapy were treated with higher TVR doses (1125 mg every 8 hours) to offset the reduction in TVR levels associated with efavirenz use; other patients received the standard TVR dose (750 mg every 8 hours).

The majority of patients were male (67 – 100%), Caucasian (29 – 87%), and infected with genotype 1 subtype a HCV (43 – 80%). The median CD4 count was high (514 to 675 cells/mm3) in all patient groups, ranging from 254 to 1189 cells/mm3. The SVR-12 rate, defined as no detectable HCV RNA at 12 weeks after discontinuing treatment, was 74% (28 of 38) in patients treated with TVR plus Peg-IFN/RBV, compared with 45% (10 of 22) in patients treated with Peg-IFN/RBV alone. Although this study included a small number of patients, there was no difference in HCV virologic outcomes among patients who received no antiretroviral agents, those treated with ritonavir-boosted atazanavir (atazanavir/ritonavir) plus tenofovir and emtricitabine or lamivudine, or those receiving a fixed-dose combination of efavirenz with tenofovir and emtricitabine.

During treatment, virologic breakthrough was observed in three TVR-treated patients (8%); after treatment discontinuation, HCV virologic relapse was reported in one of 38 TVR-treated patients (3%). Adverse events (AEs) were common among TVR-treated patients, with a greater frequency of pruritus, dizziness, headache, nausea, rash, and anemia reported compared with those treated with placebo plus Peg-IFN/RBV; however, discontinuation of study drugs because of AEs was uncommon in both groups (TVR, 3 patients; placebo, 0 patients). Importantly, no adverse impact on HIV disease parameters (HIV RNA levels and CD4 cell counts) was observed, and the steady-state pharmacokinetic profiles of the antiretroviral agents (efavirenz and atazanavir/ritonavir) and TVR were acceptable.

The authors concluded that the overall safety, tolerability, and efficacy profile of TPV in combination with Peg-IFN/RBV in this small group of patients coinfected with HIV and HCV was similar to that previously reported in patients infected with genotype 1 HCV without HIV coinfection.

BOCEPREVIR PLUS PEGINTERFERON AND RIBAVIRIN IN HCV/HIV–COINFECTED INDIVIDUALS

Sulkowski M, Pol S, Cooper C, et al. Boceprevir + pegylated interferon + ribavirin for the treatment of HCV/HIV-co-infected patients: end of treatment (week-48) interim results. Presented at: 19th Conference on Retroviruses and Opportunistic Infections; March 5-8, 2012; Seattle, Washington. Abstract 47.

(For non-subscribers to this journal, an additional fee may apply to obtain full-text articles.)


		View journal abstract				View full article

In May 2011, BOC, an HCV NS3/4A protease inhibitor, was approved by the US FDA for the treatment of genotype 1 chronic HCV infection, in combination with Peg-IFN/RBV. At the time of FDA approval, however, the safety and efficacy of BOC plus Peg-IFN/RBV in patients coinfected with HIV and HCV had not been established.

On March 5, 2012, the results of a phase 2a study of BOC vs placebo in combination with Peg-IFN/RBV for treating genotype 1 chronic HCV infection in adults with HIV was presented at the 19th CROI. In this study, 98 coinfected patients coinfected with HIV and HCV were randomized to treatment with four weeks of Peg-IFN/RBV (lead-in phase), followed by 44 weeks of combination therapy with BOC 800 mg every 8 hours (n = 64) or placebo (n = 34) plus Peg-IFN/RBV. Patients taking efavirenz or other nonnucleoside reverse-transcriptase inhibitors were excluded from the study because of findings in previously conducted drug-drug interaction studies. Patients taking ritonavir-boosted HIV-1 protease inhibitors, including darunavir, atazanavir, and lopinavir, were permitted to be enrolled in the study. However, subsequent drug-drug interaction studies were conducted and presented at the 19th CROI; these studies demonstrated significant bidirectional interactions leading to lower concentrations of the HIV-1 protease inhibitors and BOC. Pharmacokinetics of the HIV-1 protease inhibitors were not assessed in this phase 2a study.

The majority of patients were male (65 – 72%), Caucasian (81 – 82%), and infected with genotype 1 subtype a HCV (65 – 66%). The median CD4 count was high (577 to 586 cells/mm3) in all groups, ranging from 187 to 1539 cells/mm3). The SVR-12 rate was 60.7% (37 of 61 patients)) in patients treated with BOC plus Peg-IFN/RBV, compared with 26.5% (9 of 34) in patients treated with Peg-IFN/RBV alone. In addition, three patients treated with BOC plus Peg-IFN/RBV had an undetectable HCV RNA level at four weeks post treatment (SVR-4) but had not yet reached the 12-week posttreatment assessment. Although this study included a small number of patients, there was no difference in virologic outcomes among patients treated with ritonavir-boosted HIV protease inhibitors, despite the anticipated interaction with BOC resulting in lower BOC exposure. .

During treatment, HCV virologic treatment failure was observed in six patients treated with BOC (9%); after treatment discontinuation, HCV virologic relapse was reported in two patients treated with BOC (5%). During treatment, HCV virologic treatment failure was observed in 6 BOC-treated patients (9%); after treatment discontinuation, HCV virologic relapse was reported in two patients treated with BOC (5%). AEs were common among patients treated with BOC, with a greater frequency of anemia, neutropenia, pyrexia, decreased appetite, diarrhea, vomiting, and dysgeusia reported compared with those treated with placebo plus Peg-IFN/RBV. Discontinuation of study drugs because of AEs was also more common among patients treated with BOC (n = 12; 20%) compared with placebo-treated patients (n = 3; 9%). All enrolled patients were required to have an undetectable HIV RNA level on antiretroviral therapy; HIV RNA breakthrough was reported in four of 34 patients taking placebo plus Peg-IFN/RBV and three of 64 patients taking BOC plus Peg-IFN/RBV.

The authors concluded that the overall safety, tolerability, and efficacy profile of BOC in combination with Peg-IFN/RBV in this small group of patients coinfected with HIV and HCV was similar to that previously reported in patients infected with genotype 1 HCV without HIV coinfection. Additional studies of antiretroviral agents and BOC are planned in collaboration with the AIDS Clinical Trials Group.

	COMPLETE THE POST-TEST Step 1. Click on link to download instructions for the posttest and evaluation